linux/drivers/target/target_core_cdb.c
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   1/*
   2 * CDB emulation for non-READ/WRITE commands.
   3 *
   4 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
   5 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
   6 * Copyright (c) 2007-2010 Rising Tide Systems
   7 * Copyright (c) 2008-2010 Linux-iSCSI.org
   8 *
   9 * Nicholas A. Bellinger <nab@kernel.org>
  10 *
  11 * This program is free software; you can redistribute it and/or modify
  12 * it under the terms of the GNU General Public License as published by
  13 * the Free Software Foundation; either version 2 of the License, or
  14 * (at your option) any later version.
  15 *
  16 * This program is distributed in the hope that it will be useful,
  17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 * GNU General Public License for more details.
  20 *
  21 * You should have received a copy of the GNU General Public License
  22 * along with this program; if not, write to the Free Software
  23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  24 */
  25
  26#include <linux/kernel.h>
  27#include <linux/module.h>
  28#include <asm/unaligned.h>
  29#include <scsi/scsi.h>
  30
  31#include <target/target_core_base.h>
  32#include <target/target_core_backend.h>
  33#include <target/target_core_fabric.h>
  34
  35#include "target_core_internal.h"
  36#include "target_core_ua.h"
  37
  38static void
  39target_fill_alua_data(struct se_port *port, unsigned char *buf)
  40{
  41        struct t10_alua_tg_pt_gp *tg_pt_gp;
  42        struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
  43
  44        /*
  45         * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS.
  46         */
  47        buf[5]  = 0x80;
  48
  49        /*
  50         * Set TPGS field for explict and/or implict ALUA access type
  51         * and opteration.
  52         *
  53         * See spc4r17 section 6.4.2 Table 135
  54         */
  55        if (!port)
  56                return;
  57        tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
  58        if (!tg_pt_gp_mem)
  59                return;
  60
  61        spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
  62        tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
  63        if (tg_pt_gp)
  64                buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
  65        spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
  66}
  67
  68static int
  69target_emulate_inquiry_std(struct se_cmd *cmd)
  70{
  71        struct se_lun *lun = cmd->se_lun;
  72        struct se_device *dev = cmd->se_dev;
  73        struct se_portal_group *tpg = lun->lun_sep->sep_tpg;
  74        unsigned char *buf;
  75
  76        /*
  77         * Make sure we at least have 6 bytes of INQUIRY response
  78         * payload going back for EVPD=0
  79         */
  80        if (cmd->data_length < 6) {
  81                pr_err("SCSI Inquiry payload length: %u"
  82                        " too small for EVPD=0\n", cmd->data_length);
  83                return -EINVAL;
  84        }
  85
  86        buf = transport_kmap_data_sg(cmd);
  87
  88        if (dev == tpg->tpg_virt_lun0.lun_se_dev) {
  89                buf[0] = 0x3f; /* Not connected */
  90        } else {
  91                buf[0] = dev->transport->get_device_type(dev);
  92                if (buf[0] == TYPE_TAPE)
  93                        buf[1] = 0x80;
  94        }
  95        buf[2] = dev->transport->get_device_rev(dev);
  96
  97        /*
  98         * NORMACA and HISUP = 0, RESPONSE DATA FORMAT = 2
  99         *
 100         * SPC4 says:
 101         *   A RESPONSE DATA FORMAT field set to 2h indicates that the
 102         *   standard INQUIRY data is in the format defined in this
 103         *   standard. Response data format values less than 2h are
 104         *   obsolete. Response data format values greater than 2h are
 105         *   reserved.
 106         */
 107        buf[3] = 2;
 108
 109        /*
 110         * Enable SCCS and TPGS fields for Emulated ALUA
 111         */
 112        if (dev->se_sub_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED)
 113                target_fill_alua_data(lun->lun_sep, buf);
 114
 115        if (cmd->data_length < 8) {
 116                buf[4] = 1; /* Set additional length to 1 */
 117                goto out;
 118        }
 119
 120        buf[7] = 0x32; /* Sync=1 and CmdQue=1 */
 121
 122        /*
 123         * Do not include vendor, product, reversion info in INQUIRY
 124         * response payload for cdbs with a small allocation length.
 125         */
 126        if (cmd->data_length < 36) {
 127                buf[4] = 3; /* Set additional length to 3 */
 128                goto out;
 129        }
 130
 131        snprintf(&buf[8], 8, "LIO-ORG");
 132        snprintf(&buf[16], 16, "%s", dev->se_sub_dev->t10_wwn.model);
 133        snprintf(&buf[32], 4, "%s", dev->se_sub_dev->t10_wwn.revision);
 134        buf[4] = 31; /* Set additional length to 31 */
 135
 136out:
 137        transport_kunmap_data_sg(cmd);
 138        return 0;
 139}
 140
 141/* unit serial number */
 142static int
 143target_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
 144{
 145        struct se_device *dev = cmd->se_dev;
 146        u16 len = 0;
 147
 148        if (dev->se_sub_dev->su_dev_flags &
 149                        SDF_EMULATED_VPD_UNIT_SERIAL) {
 150                u32 unit_serial_len;
 151
 152                unit_serial_len = strlen(dev->se_sub_dev->t10_wwn.unit_serial);
 153                unit_serial_len++; /* For NULL Terminator */
 154
 155                if (((len + 4) + unit_serial_len) > cmd->data_length) {
 156                        len += unit_serial_len;
 157                        buf[2] = ((len >> 8) & 0xff);
 158                        buf[3] = (len & 0xff);
 159                        return 0;
 160                }
 161                len += sprintf(&buf[4], "%s",
 162                        dev->se_sub_dev->t10_wwn.unit_serial);
 163                len++; /* Extra Byte for NULL Terminator */
 164                buf[3] = len;
 165        }
 166        return 0;
 167}
 168
 169static void
 170target_parse_naa_6h_vendor_specific(struct se_device *dev, unsigned char *buf)
 171{
 172        unsigned char *p = &dev->se_sub_dev->t10_wwn.unit_serial[0];
 173        int cnt;
 174        bool next = true;
 175
 176        /*
 177         * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
 178         * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
 179         * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION
 180         * to complete the payload.  These are based from VPD=0x80 PRODUCT SERIAL
 181         * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
 182         * per device uniqeness.
 183         */
 184        for (cnt = 0; *p && cnt < 13; p++) {
 185                int val = hex_to_bin(*p);
 186
 187                if (val < 0)
 188                        continue;
 189
 190                if (next) {
 191                        next = false;
 192                        buf[cnt++] |= val;
 193                } else {
 194                        next = true;
 195                        buf[cnt] = val << 4;
 196                }
 197        }
 198}
 199
 200/*
 201 * Device identification VPD, for a complete list of
 202 * DESIGNATOR TYPEs see spc4r17 Table 459.
 203 */
 204static int
 205target_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
 206{
 207        struct se_device *dev = cmd->se_dev;
 208        struct se_lun *lun = cmd->se_lun;
 209        struct se_port *port = NULL;
 210        struct se_portal_group *tpg = NULL;
 211        struct t10_alua_lu_gp_member *lu_gp_mem;
 212        struct t10_alua_tg_pt_gp *tg_pt_gp;
 213        struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
 214        unsigned char *prod = &dev->se_sub_dev->t10_wwn.model[0];
 215        u32 prod_len;
 216        u32 unit_serial_len, off = 0;
 217        u16 len = 0, id_len;
 218
 219        off = 4;
 220
 221        /*
 222         * NAA IEEE Registered Extended Assigned designator format, see
 223         * spc4r17 section 7.7.3.6.5
 224         *
 225         * We depend upon a target_core_mod/ConfigFS provided
 226         * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
 227         * value in order to return the NAA id.
 228         */
 229        if (!(dev->se_sub_dev->su_dev_flags & SDF_EMULATED_VPD_UNIT_SERIAL))
 230                goto check_t10_vend_desc;
 231
 232        if (off + 20 > cmd->data_length)
 233                goto check_t10_vend_desc;
 234
 235        /* CODE SET == Binary */
 236        buf[off++] = 0x1;
 237
 238        /* Set ASSOCIATION == addressed logical unit: 0)b */
 239        buf[off] = 0x00;
 240
 241        /* Identifier/Designator type == NAA identifier */
 242        buf[off++] |= 0x3;
 243        off++;
 244
 245        /* Identifier/Designator length */
 246        buf[off++] = 0x10;
 247
 248        /*
 249         * Start NAA IEEE Registered Extended Identifier/Designator
 250         */
 251        buf[off++] = (0x6 << 4);
 252
 253        /*
 254         * Use OpenFabrics IEEE Company ID: 00 14 05
 255         */
 256        buf[off++] = 0x01;
 257        buf[off++] = 0x40;
 258        buf[off] = (0x5 << 4);
 259
 260        /*
 261         * Return ConfigFS Unit Serial Number information for
 262         * VENDOR_SPECIFIC_IDENTIFIER and
 263         * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
 264         */
 265        target_parse_naa_6h_vendor_specific(dev, &buf[off]);
 266
 267        len = 20;
 268        off = (len + 4);
 269
 270check_t10_vend_desc:
 271        /*
 272         * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
 273         */
 274        id_len = 8; /* For Vendor field */
 275        prod_len = 4; /* For VPD Header */
 276        prod_len += 8; /* For Vendor field */
 277        prod_len += strlen(prod);
 278        prod_len++; /* For : */
 279
 280        if (dev->se_sub_dev->su_dev_flags &
 281                        SDF_EMULATED_VPD_UNIT_SERIAL) {
 282                unit_serial_len =
 283                        strlen(&dev->se_sub_dev->t10_wwn.unit_serial[0]);
 284                unit_serial_len++; /* For NULL Terminator */
 285
 286                if ((len + (id_len + 4) +
 287                    (prod_len + unit_serial_len)) >
 288                                cmd->data_length) {
 289                        len += (prod_len + unit_serial_len);
 290                        goto check_port;
 291                }
 292                id_len += sprintf(&buf[off+12], "%s:%s", prod,
 293                                &dev->se_sub_dev->t10_wwn.unit_serial[0]);
 294        }
 295        buf[off] = 0x2; /* ASCII */
 296        buf[off+1] = 0x1; /* T10 Vendor ID */
 297        buf[off+2] = 0x0;
 298        memcpy(&buf[off+4], "LIO-ORG", 8);
 299        /* Extra Byte for NULL Terminator */
 300        id_len++;
 301        /* Identifier Length */
 302        buf[off+3] = id_len;
 303        /* Header size for Designation descriptor */
 304        len += (id_len + 4);
 305        off += (id_len + 4);
 306        /*
 307         * struct se_port is only set for INQUIRY VPD=1 through $FABRIC_MOD
 308         */
 309check_port:
 310        port = lun->lun_sep;
 311        if (port) {
 312                struct t10_alua_lu_gp *lu_gp;
 313                u32 padding, scsi_name_len;
 314                u16 lu_gp_id = 0;
 315                u16 tg_pt_gp_id = 0;
 316                u16 tpgt;
 317
 318                tpg = port->sep_tpg;
 319                /*
 320                 * Relative target port identifer, see spc4r17
 321                 * section 7.7.3.7
 322                 *
 323                 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
 324                 * section 7.5.1 Table 362
 325                 */
 326                if (((len + 4) + 8) > cmd->data_length) {
 327                        len += 8;
 328                        goto check_tpgi;
 329                }
 330                buf[off] =
 331                        (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
 332                buf[off++] |= 0x1; /* CODE SET == Binary */
 333                buf[off] = 0x80; /* Set PIV=1 */
 334                /* Set ASSOCIATION == target port: 01b */
 335                buf[off] |= 0x10;
 336                /* DESIGNATOR TYPE == Relative target port identifer */
 337                buf[off++] |= 0x4;
 338                off++; /* Skip over Reserved */
 339                buf[off++] = 4; /* DESIGNATOR LENGTH */
 340                /* Skip over Obsolete field in RTPI payload
 341                 * in Table 472 */
 342                off += 2;
 343                buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
 344                buf[off++] = (port->sep_rtpi & 0xff);
 345                len += 8; /* Header size + Designation descriptor */
 346                /*
 347                 * Target port group identifier, see spc4r17
 348                 * section 7.7.3.8
 349                 *
 350                 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
 351                 * section 7.5.1 Table 362
 352                 */
 353check_tpgi:
 354                if (dev->se_sub_dev->t10_alua.alua_type !=
 355                                SPC3_ALUA_EMULATED)
 356                        goto check_scsi_name;
 357
 358                if (((len + 4) + 8) > cmd->data_length) {
 359                        len += 8;
 360                        goto check_lu_gp;
 361                }
 362                tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
 363                if (!tg_pt_gp_mem)
 364                        goto check_lu_gp;
 365
 366                spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 367                tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
 368                if (!tg_pt_gp) {
 369                        spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 370                        goto check_lu_gp;
 371                }
 372                tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
 373                spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 374
 375                buf[off] =
 376                        (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
 377                buf[off++] |= 0x1; /* CODE SET == Binary */
 378                buf[off] = 0x80; /* Set PIV=1 */
 379                /* Set ASSOCIATION == target port: 01b */
 380                buf[off] |= 0x10;
 381                /* DESIGNATOR TYPE == Target port group identifier */
 382                buf[off++] |= 0x5;
 383                off++; /* Skip over Reserved */
 384                buf[off++] = 4; /* DESIGNATOR LENGTH */
 385                off += 2; /* Skip over Reserved Field */
 386                buf[off++] = ((tg_pt_gp_id >> 8) & 0xff);
 387                buf[off++] = (tg_pt_gp_id & 0xff);
 388                len += 8; /* Header size + Designation descriptor */
 389                /*
 390                 * Logical Unit Group identifier, see spc4r17
 391                 * section 7.7.3.8
 392                 */
 393check_lu_gp:
 394                if (((len + 4) + 8) > cmd->data_length) {
 395                        len += 8;
 396                        goto check_scsi_name;
 397                }
 398                lu_gp_mem = dev->dev_alua_lu_gp_mem;
 399                if (!lu_gp_mem)
 400                        goto check_scsi_name;
 401
 402                spin_lock(&lu_gp_mem->lu_gp_mem_lock);
 403                lu_gp = lu_gp_mem->lu_gp;
 404                if (!lu_gp) {
 405                        spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
 406                        goto check_scsi_name;
 407                }
 408                lu_gp_id = lu_gp->lu_gp_id;
 409                spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
 410
 411                buf[off++] |= 0x1; /* CODE SET == Binary */
 412                /* DESIGNATOR TYPE == Logical Unit Group identifier */
 413                buf[off++] |= 0x6;
 414                off++; /* Skip over Reserved */
 415                buf[off++] = 4; /* DESIGNATOR LENGTH */
 416                off += 2; /* Skip over Reserved Field */
 417                buf[off++] = ((lu_gp_id >> 8) & 0xff);
 418                buf[off++] = (lu_gp_id & 0xff);
 419                len += 8; /* Header size + Designation descriptor */
 420                /*
 421                 * SCSI name string designator, see spc4r17
 422                 * section 7.7.3.11
 423                 *
 424                 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
 425                 * section 7.5.1 Table 362
 426                 */
 427check_scsi_name:
 428                scsi_name_len = strlen(tpg->se_tpg_tfo->tpg_get_wwn(tpg));
 429                /* UTF-8 ",t,0x<16-bit TPGT>" + NULL Terminator */
 430                scsi_name_len += 10;
 431                /* Check for 4-byte padding */
 432                padding = ((-scsi_name_len) & 3);
 433                if (padding != 0)
 434                        scsi_name_len += padding;
 435                /* Header size + Designation descriptor */
 436                scsi_name_len += 4;
 437
 438                if (((len + 4) + scsi_name_len) > cmd->data_length) {
 439                        len += scsi_name_len;
 440                        goto set_len;
 441                }
 442                buf[off] =
 443                        (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
 444                buf[off++] |= 0x3; /* CODE SET == UTF-8 */
 445                buf[off] = 0x80; /* Set PIV=1 */
 446                /* Set ASSOCIATION == target port: 01b */
 447                buf[off] |= 0x10;
 448                /* DESIGNATOR TYPE == SCSI name string */
 449                buf[off++] |= 0x8;
 450                off += 2; /* Skip over Reserved and length */
 451                /*
 452                 * SCSI name string identifer containing, $FABRIC_MOD
 453                 * dependent information.  For LIO-Target and iSCSI
 454                 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
 455                 * UTF-8 encoding.
 456                 */
 457                tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
 458                scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
 459                                        tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt);
 460                scsi_name_len += 1 /* Include  NULL terminator */;
 461                /*
 462                 * The null-terminated, null-padded (see 4.4.2) SCSI
 463                 * NAME STRING field contains a UTF-8 format string.
 464                 * The number of bytes in the SCSI NAME STRING field
 465                 * (i.e., the value in the DESIGNATOR LENGTH field)
 466                 * shall be no larger than 256 and shall be a multiple
 467                 * of four.
 468                 */
 469                if (padding)
 470                        scsi_name_len += padding;
 471
 472                buf[off-1] = scsi_name_len;
 473                off += scsi_name_len;
 474                /* Header size + Designation descriptor */
 475                len += (scsi_name_len + 4);
 476        }
 477set_len:
 478        buf[2] = ((len >> 8) & 0xff);
 479        buf[3] = (len & 0xff); /* Page Length for VPD 0x83 */
 480        return 0;
 481}
 482
 483/* Extended INQUIRY Data VPD Page */
 484static int
 485target_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
 486{
 487        if (cmd->data_length < 60)
 488                return 0;
 489
 490        buf[3] = 0x3c;
 491        /* Set HEADSUP, ORDSUP, SIMPSUP */
 492        buf[5] = 0x07;
 493
 494        /* If WriteCache emulation is enabled, set V_SUP */
 495        if (cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0)
 496                buf[6] = 0x01;
 497        return 0;
 498}
 499
 500/* Block Limits VPD page */
 501static int
 502target_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
 503{
 504        struct se_device *dev = cmd->se_dev;
 505        int have_tp = 0;
 506
 507        /*
 508         * Following sbc3r22 section 6.5.3 Block Limits VPD page, when
 509         * emulate_tpu=1 or emulate_tpws=1 we will be expect a
 510         * different page length for Thin Provisioning.
 511         */
 512        if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
 513                have_tp = 1;
 514
 515        if (cmd->data_length < (0x10 + 4)) {
 516                pr_debug("Received data_length: %u"
 517                        " too small for EVPD 0xb0\n",
 518                        cmd->data_length);
 519                return -EINVAL;
 520        }
 521
 522        if (have_tp && cmd->data_length < (0x3c + 4)) {
 523                pr_debug("Received data_length: %u"
 524                        " too small for TPE=1 EVPD 0xb0\n",
 525                        cmd->data_length);
 526                have_tp = 0;
 527        }
 528
 529        buf[0] = dev->transport->get_device_type(dev);
 530        buf[3] = have_tp ? 0x3c : 0x10;
 531
 532        /* Set WSNZ to 1 */
 533        buf[4] = 0x01;
 534
 535        /*
 536         * Set OPTIMAL TRANSFER LENGTH GRANULARITY
 537         */
 538        put_unaligned_be16(1, &buf[6]);
 539
 540        /*
 541         * Set MAXIMUM TRANSFER LENGTH
 542         */
 543        put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_sectors, &buf[8]);
 544
 545        /*
 546         * Set OPTIMAL TRANSFER LENGTH
 547         */
 548        put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.optimal_sectors, &buf[12]);
 549
 550        /*
 551         * Exit now if we don't support TP or the initiator sent a too
 552         * short buffer.
 553         */
 554        if (!have_tp || cmd->data_length < (0x3c + 4))
 555                return 0;
 556
 557        /*
 558         * Set MAXIMUM UNMAP LBA COUNT
 559         */
 560        put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count, &buf[20]);
 561
 562        /*
 563         * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
 564         */
 565        put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count,
 566                           &buf[24]);
 567
 568        /*
 569         * Set OPTIMAL UNMAP GRANULARITY
 570         */
 571        put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity, &buf[28]);
 572
 573        /*
 574         * UNMAP GRANULARITY ALIGNMENT
 575         */
 576        put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment,
 577                           &buf[32]);
 578        if (dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment != 0)
 579                buf[32] |= 0x80; /* Set the UGAVALID bit */
 580
 581        return 0;
 582}
 583
 584/* Block Device Characteristics VPD page */
 585static int
 586target_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
 587{
 588        struct se_device *dev = cmd->se_dev;
 589
 590        buf[0] = dev->transport->get_device_type(dev);
 591        buf[3] = 0x3c;
 592
 593        if (cmd->data_length >= 5 &&
 594            dev->se_sub_dev->se_dev_attrib.is_nonrot)
 595                buf[5] = 1;
 596
 597        return 0;
 598}
 599
 600/* Thin Provisioning VPD */
 601static int
 602target_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
 603{
 604        struct se_device *dev = cmd->se_dev;
 605
 606        /*
 607         * From sbc3r22 section 6.5.4 Thin Provisioning VPD page:
 608         *
 609         * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
 610         * zero, then the page length shall be set to 0004h.  If the DP bit
 611         * is set to one, then the page length shall be set to the value
 612         * defined in table 162.
 613         */
 614        buf[0] = dev->transport->get_device_type(dev);
 615
 616        /*
 617         * Set Hardcoded length mentioned above for DP=0
 618         */
 619        put_unaligned_be16(0x0004, &buf[2]);
 620
 621        /*
 622         * The THRESHOLD EXPONENT field indicates the threshold set size in
 623         * LBAs as a power of 2 (i.e., the threshold set size is equal to
 624         * 2(threshold exponent)).
 625         *
 626         * Note that this is currently set to 0x00 as mkp says it will be
 627         * changing again.  We can enable this once it has settled in T10
 628         * and is actually used by Linux/SCSI ML code.
 629         */
 630        buf[4] = 0x00;
 631
 632        /*
 633         * A TPU bit set to one indicates that the device server supports
 634         * the UNMAP command (see 5.25). A TPU bit set to zero indicates
 635         * that the device server does not support the UNMAP command.
 636         */
 637        if (dev->se_sub_dev->se_dev_attrib.emulate_tpu != 0)
 638                buf[5] = 0x80;
 639
 640        /*
 641         * A TPWS bit set to one indicates that the device server supports
 642         * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
 643         * A TPWS bit set to zero indicates that the device server does not
 644         * support the use of the WRITE SAME (16) command to unmap LBAs.
 645         */
 646        if (dev->se_sub_dev->se_dev_attrib.emulate_tpws != 0)
 647                buf[5] |= 0x40;
 648
 649        return 0;
 650}
 651
 652static int
 653target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
 654
 655static struct {
 656        uint8_t         page;
 657        int             (*emulate)(struct se_cmd *, unsigned char *);
 658} evpd_handlers[] = {
 659        { .page = 0x00, .emulate = target_emulate_evpd_00 },
 660        { .page = 0x80, .emulate = target_emulate_evpd_80 },
 661        { .page = 0x83, .emulate = target_emulate_evpd_83 },
 662        { .page = 0x86, .emulate = target_emulate_evpd_86 },
 663        { .page = 0xb0, .emulate = target_emulate_evpd_b0 },
 664        { .page = 0xb1, .emulate = target_emulate_evpd_b1 },
 665        { .page = 0xb2, .emulate = target_emulate_evpd_b2 },
 666};
 667
 668/* supported vital product data pages */
 669static int
 670target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
 671{
 672        int p;
 673
 674        if (cmd->data_length < 8)
 675                return 0;
 676        /*
 677         * Only report the INQUIRY EVPD=1 pages after a valid NAA
 678         * Registered Extended LUN WWN has been set via ConfigFS
 679         * during device creation/restart.
 680         */
 681        if (cmd->se_dev->se_sub_dev->su_dev_flags &
 682                        SDF_EMULATED_VPD_UNIT_SERIAL) {
 683                buf[3] = ARRAY_SIZE(evpd_handlers);
 684                for (p = 0; p < min_t(int, ARRAY_SIZE(evpd_handlers),
 685                                      cmd->data_length - 4); ++p)
 686                        buf[p + 4] = evpd_handlers[p].page;
 687        }
 688
 689        return 0;
 690}
 691
 692int target_emulate_inquiry(struct se_task *task)
 693{
 694        struct se_cmd *cmd = task->task_se_cmd;
 695        struct se_device *dev = cmd->se_dev;
 696        unsigned char *buf;
 697        unsigned char *cdb = cmd->t_task_cdb;
 698        int p, ret;
 699
 700        if (!(cdb[1] & 0x1)) {
 701                if (cdb[2]) {
 702                        pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n",
 703                               cdb[2]);
 704                        cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
 705                        return -EINVAL;
 706                }
 707
 708                ret = target_emulate_inquiry_std(cmd);
 709                goto out;
 710        }
 711
 712        /*
 713         * Make sure we at least have 4 bytes of INQUIRY response
 714         * payload for 0x00 going back for EVPD=1.  Note that 0x80
 715         * and 0x83 will check for enough payload data length and
 716         * jump to set_len: label when there is not enough inquiry EVPD
 717         * payload length left for the next outgoing EVPD metadata
 718         */
 719        if (cmd->data_length < 4) {
 720                pr_err("SCSI Inquiry payload length: %u"
 721                        " too small for EVPD=1\n", cmd->data_length);
 722                cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
 723                return -EINVAL;
 724        }
 725
 726        buf = transport_kmap_data_sg(cmd);
 727
 728        buf[0] = dev->transport->get_device_type(dev);
 729
 730        for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) {
 731                if (cdb[2] == evpd_handlers[p].page) {
 732                        buf[1] = cdb[2];
 733                        ret = evpd_handlers[p].emulate(cmd, buf);
 734                        goto out_unmap;
 735                }
 736        }
 737
 738        pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]);
 739        cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
 740        ret = -EINVAL;
 741
 742out_unmap:
 743        transport_kunmap_data_sg(cmd);
 744out:
 745        if (!ret) {
 746                task->task_scsi_status = GOOD;
 747                transport_complete_task(task, 1);
 748        }
 749        return ret;
 750}
 751
 752int target_emulate_readcapacity(struct se_task *task)
 753{
 754        struct se_cmd *cmd = task->task_se_cmd;
 755        struct se_device *dev = cmd->se_dev;
 756        unsigned char *buf;
 757        unsigned long long blocks_long = dev->transport->get_blocks(dev);
 758        u32 blocks;
 759
 760        if (blocks_long >= 0x00000000ffffffff)
 761                blocks = 0xffffffff;
 762        else
 763                blocks = (u32)blocks_long;
 764
 765        buf = transport_kmap_data_sg(cmd);
 766
 767        buf[0] = (blocks >> 24) & 0xff;
 768        buf[1] = (blocks >> 16) & 0xff;
 769        buf[2] = (blocks >> 8) & 0xff;
 770        buf[3] = blocks & 0xff;
 771        buf[4] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
 772        buf[5] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
 773        buf[6] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
 774        buf[7] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
 775        /*
 776         * Set max 32-bit blocks to signal SERVICE ACTION READ_CAPACITY_16
 777        */
 778        if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
 779                put_unaligned_be32(0xFFFFFFFF, &buf[0]);
 780
 781        transport_kunmap_data_sg(cmd);
 782
 783        task->task_scsi_status = GOOD;
 784        transport_complete_task(task, 1);
 785        return 0;
 786}
 787
 788int target_emulate_readcapacity_16(struct se_task *task)
 789{
 790        struct se_cmd *cmd = task->task_se_cmd;
 791        struct se_device *dev = cmd->se_dev;
 792        unsigned char *buf;
 793        unsigned long long blocks = dev->transport->get_blocks(dev);
 794
 795        buf = transport_kmap_data_sg(cmd);
 796
 797        buf[0] = (blocks >> 56) & 0xff;
 798        buf[1] = (blocks >> 48) & 0xff;
 799        buf[2] = (blocks >> 40) & 0xff;
 800        buf[3] = (blocks >> 32) & 0xff;
 801        buf[4] = (blocks >> 24) & 0xff;
 802        buf[5] = (blocks >> 16) & 0xff;
 803        buf[6] = (blocks >> 8) & 0xff;
 804        buf[7] = blocks & 0xff;
 805        buf[8] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
 806        buf[9] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
 807        buf[10] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
 808        buf[11] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
 809        /*
 810         * Set Thin Provisioning Enable bit following sbc3r22 in section
 811         * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
 812         */
 813        if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
 814                buf[14] = 0x80;
 815
 816        transport_kunmap_data_sg(cmd);
 817
 818        task->task_scsi_status = GOOD;
 819        transport_complete_task(task, 1);
 820        return 0;
 821}
 822
 823static int
 824target_modesense_rwrecovery(unsigned char *p)
 825{
 826        p[0] = 0x01;
 827        p[1] = 0x0a;
 828
 829        return 12;
 830}
 831
 832static int
 833target_modesense_control(struct se_device *dev, unsigned char *p)
 834{
 835        p[0] = 0x0a;
 836        p[1] = 0x0a;
 837        p[2] = 2;
 838        /*
 839         * From spc4r23, 7.4.7 Control mode page
 840         *
 841         * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies
 842         * restrictions on the algorithm used for reordering commands
 843         * having the SIMPLE task attribute (see SAM-4).
 844         *
 845         *                    Table 368 -- QUEUE ALGORITHM MODIFIER field
 846         *                         Code      Description
 847         *                          0h       Restricted reordering
 848         *                          1h       Unrestricted reordering allowed
 849         *                          2h to 7h    Reserved
 850         *                          8h to Fh    Vendor specific
 851         *
 852         * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that
 853         * the device server shall order the processing sequence of commands
 854         * having the SIMPLE task attribute such that data integrity is maintained
 855         * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
 856         * requests is halted at any time, the final value of all data observable
 857         * on the medium shall be the same as if all the commands had been processed
 858         * with the ORDERED task attribute).
 859         *
 860         * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the
 861         * device server may reorder the processing sequence of commands having the
 862         * SIMPLE task attribute in any manner. Any data integrity exposures related to
 863         * command sequence order shall be explicitly handled by the application client
 864         * through the selection of appropriate ommands and task attributes.
 865         */
 866        p[3] = (dev->se_sub_dev->se_dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10;
 867        /*
 868         * From spc4r17, section 7.4.6 Control mode Page
 869         *
 870         * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
 871         *
 872         * 00b: The logical unit shall clear any unit attention condition
 873         * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
 874         * status and shall not establish a unit attention condition when a com-
 875         * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
 876         * status.
 877         *
 878         * 10b: The logical unit shall not clear any unit attention condition
 879         * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
 880         * status and shall not establish a unit attention condition when
 881         * a command is completed with BUSY, TASK SET FULL, or RESERVATION
 882         * CONFLICT status.
 883         *
 884         * 11b a The logical unit shall not clear any unit attention condition
 885         * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
 886         * status and shall establish a unit attention condition for the
 887         * initiator port associated with the I_T nexus on which the BUSY,
 888         * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
 889         * Depending on the status, the additional sense code shall be set to
 890         * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
 891         * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
 892         * command, a unit attention condition shall be established only once
 893         * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
 894         * to the number of commands completed with one of those status codes.
 895         */
 896        p[4] = (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 :
 897               (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00;
 898        /*
 899         * From spc4r17, section 7.4.6 Control mode Page
 900         *
 901         * Task Aborted Status (TAS) bit set to zero.
 902         *
 903         * A task aborted status (TAS) bit set to zero specifies that aborted
 904         * tasks shall be terminated by the device server without any response
 905         * to the application client. A TAS bit set to one specifies that tasks
 906         * aborted by the actions of an I_T nexus other than the I_T nexus on
 907         * which the command was received shall be completed with TASK ABORTED
 908         * status (see SAM-4).
 909         */
 910        p[5] = (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? 0x40 : 0x00;
 911        p[8] = 0xff;
 912        p[9] = 0xff;
 913        p[11] = 30;
 914
 915        return 12;
 916}
 917
 918static int
 919target_modesense_caching(struct se_device *dev, unsigned char *p)
 920{
 921        p[0] = 0x08;
 922        p[1] = 0x12;
 923        if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0)
 924                p[2] = 0x04; /* Write Cache Enable */
 925        p[12] = 0x20; /* Disabled Read Ahead */
 926
 927        return 20;
 928}
 929
 930static void
 931target_modesense_write_protect(unsigned char *buf, int type)
 932{
 933        /*
 934         * I believe that the WP bit (bit 7) in the mode header is the same for
 935         * all device types..
 936         */
 937        switch (type) {
 938        case TYPE_DISK:
 939        case TYPE_TAPE:
 940        default:
 941                buf[0] |= 0x80; /* WP bit */
 942                break;
 943        }
 944}
 945
 946static void
 947target_modesense_dpofua(unsigned char *buf, int type)
 948{
 949        switch (type) {
 950        case TYPE_DISK:
 951                buf[0] |= 0x10; /* DPOFUA bit */
 952                break;
 953        default:
 954                break;
 955        }
 956}
 957
 958int target_emulate_modesense(struct se_task *task)
 959{
 960        struct se_cmd *cmd = task->task_se_cmd;
 961        struct se_device *dev = cmd->se_dev;
 962        char *cdb = cmd->t_task_cdb;
 963        unsigned char *rbuf;
 964        int type = dev->transport->get_device_type(dev);
 965        int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10);
 966        int offset = ten ? 8 : 4;
 967        int length = 0;
 968        unsigned char buf[SE_MODE_PAGE_BUF];
 969
 970        memset(buf, 0, SE_MODE_PAGE_BUF);
 971
 972        switch (cdb[2] & 0x3f) {
 973        case 0x01:
 974                length = target_modesense_rwrecovery(&buf[offset]);
 975                break;
 976        case 0x08:
 977                length = target_modesense_caching(dev, &buf[offset]);
 978                break;
 979        case 0x0a:
 980                length = target_modesense_control(dev, &buf[offset]);
 981                break;
 982        case 0x3f:
 983                length = target_modesense_rwrecovery(&buf[offset]);
 984                length += target_modesense_caching(dev, &buf[offset+length]);
 985                length += target_modesense_control(dev, &buf[offset+length]);
 986                break;
 987        default:
 988                pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
 989                       cdb[2] & 0x3f, cdb[3]);
 990                cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
 991                return -EINVAL;
 992        }
 993        offset += length;
 994
 995        if (ten) {
 996                offset -= 2;
 997                buf[0] = (offset >> 8) & 0xff;
 998                buf[1] = offset & 0xff;
 999
1000                if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
1001                    (cmd->se_deve &&
1002                    (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
1003                        target_modesense_write_protect(&buf[3], type);
1004
1005                if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) &&
1006                    (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0))
1007                        target_modesense_dpofua(&buf[3], type);
1008
1009                if ((offset + 2) > cmd->data_length)
1010                        offset = cmd->data_length;
1011
1012        } else {
1013                offset -= 1;
1014                buf[0] = offset & 0xff;
1015
1016                if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
1017                    (cmd->se_deve &&
1018                    (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
1019                        target_modesense_write_protect(&buf[2], type);
1020
1021                if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) &&
1022                    (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0))
1023                        target_modesense_dpofua(&buf[2], type);
1024
1025                if ((offset + 1) > cmd->data_length)
1026                        offset = cmd->data_length;
1027        }
1028
1029        rbuf = transport_kmap_data_sg(cmd);
1030        memcpy(rbuf, buf, offset);
1031        transport_kunmap_data_sg(cmd);
1032
1033        task->task_scsi_status = GOOD;
1034        transport_complete_task(task, 1);
1035        return 0;
1036}
1037
1038int target_emulate_request_sense(struct se_task *task)
1039{
1040        struct se_cmd *cmd = task->task_se_cmd;
1041        unsigned char *cdb = cmd->t_task_cdb;
1042        unsigned char *buf;
1043        u8 ua_asc = 0, ua_ascq = 0;
1044        int err = 0;
1045
1046        if (cdb[1] & 0x01) {
1047                pr_err("REQUEST_SENSE description emulation not"
1048                        " supported\n");
1049                cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1050                return -ENOSYS;
1051        }
1052
1053        buf = transport_kmap_data_sg(cmd);
1054
1055        if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq)) {
1056                /*
1057                 * CURRENT ERROR, UNIT ATTENTION
1058                 */
1059                buf[0] = 0x70;
1060                buf[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
1061
1062                if (cmd->data_length < 18) {
1063                        buf[7] = 0x00;
1064                        err = -EINVAL;
1065                        goto end;
1066                }
1067                /*
1068                 * The Additional Sense Code (ASC) from the UNIT ATTENTION
1069                 */
1070                buf[SPC_ASC_KEY_OFFSET] = ua_asc;
1071                buf[SPC_ASCQ_KEY_OFFSET] = ua_ascq;
1072                buf[7] = 0x0A;
1073        } else {
1074                /*
1075                 * CURRENT ERROR, NO SENSE
1076                 */
1077                buf[0] = 0x70;
1078                buf[SPC_SENSE_KEY_OFFSET] = NO_SENSE;
1079
1080                if (cmd->data_length < 18) {
1081                        buf[7] = 0x00;
1082                        err = -EINVAL;
1083                        goto end;
1084                }
1085                /*
1086                 * NO ADDITIONAL SENSE INFORMATION
1087                 */
1088                buf[SPC_ASC_KEY_OFFSET] = 0x00;
1089                buf[7] = 0x0A;
1090        }
1091
1092end:
1093        transport_kunmap_data_sg(cmd);
1094        task->task_scsi_status = GOOD;
1095        transport_complete_task(task, 1);
1096        return 0;
1097}
1098
1099/*
1100 * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
1101 * Note this is not used for TCM/pSCSI passthrough
1102 */
1103int target_emulate_unmap(struct se_task *task)
1104{
1105        struct se_cmd *cmd = task->task_se_cmd;
1106        struct se_device *dev = cmd->se_dev;
1107        unsigned char *buf, *ptr = NULL;
1108        unsigned char *cdb = &cmd->t_task_cdb[0];
1109        sector_t lba;
1110        unsigned int size = cmd->data_length, range;
1111        int ret = 0, offset;
1112        unsigned short dl, bd_dl;
1113
1114        if (!dev->transport->do_discard) {
1115                pr_err("UNMAP emulation not supported for: %s\n",
1116                                dev->transport->name);
1117                cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1118                return -ENOSYS;
1119        }
1120
1121        /* First UNMAP block descriptor starts at 8 byte offset */
1122        offset = 8;
1123        size -= 8;
1124        dl = get_unaligned_be16(&cdb[0]);
1125        bd_dl = get_unaligned_be16(&cdb[2]);
1126
1127        buf = transport_kmap_data_sg(cmd);
1128
1129        ptr = &buf[offset];
1130        pr_debug("UNMAP: Sub: %s Using dl: %hu bd_dl: %hu size: %hu"
1131                " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
1132
1133        while (size) {
1134                lba = get_unaligned_be64(&ptr[0]);
1135                range = get_unaligned_be32(&ptr[8]);
1136                pr_debug("UNMAP: Using lba: %llu and range: %u\n",
1137                                 (unsigned long long)lba, range);
1138
1139                ret = dev->transport->do_discard(dev, lba, range);
1140                if (ret < 0) {
1141                        pr_err("blkdev_issue_discard() failed: %d\n",
1142                                        ret);
1143                        goto err;
1144                }
1145
1146                ptr += 16;
1147                size -= 16;
1148        }
1149
1150err:
1151        transport_kunmap_data_sg(cmd);
1152        if (!ret) {
1153                task->task_scsi_status = GOOD;
1154                transport_complete_task(task, 1);
1155        }
1156        return ret;
1157}
1158
1159/*
1160 * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
1161 * Note this is not used for TCM/pSCSI passthrough
1162 */
1163int target_emulate_write_same(struct se_task *task)
1164{
1165        struct se_cmd *cmd = task->task_se_cmd;
1166        struct se_device *dev = cmd->se_dev;
1167        sector_t range;
1168        sector_t lba = cmd->t_task_lba;
1169        u32 num_blocks;
1170        int ret;
1171
1172        if (!dev->transport->do_discard) {
1173                pr_err("WRITE_SAME emulation not supported"
1174                                " for: %s\n", dev->transport->name);
1175                cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1176                return -ENOSYS;
1177        }
1178
1179        if (cmd->t_task_cdb[0] == WRITE_SAME)
1180                num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
1181        else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
1182                num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
1183        else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
1184                num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
1185
1186        /*
1187         * Use the explicit range when non zero is supplied, otherwise calculate
1188         * the remaining range based on ->get_blocks() - starting LBA.
1189         */
1190        if (num_blocks != 0)
1191                range = num_blocks;
1192        else
1193                range = (dev->transport->get_blocks(dev) - lba);
1194
1195        pr_debug("WRITE_SAME UNMAP: LBA: %llu Range: %llu\n",
1196                 (unsigned long long)lba, (unsigned long long)range);
1197
1198        ret = dev->transport->do_discard(dev, lba, range);
1199        if (ret < 0) {
1200                pr_debug("blkdev_issue_discard() failed for WRITE_SAME\n");
1201                return ret;
1202        }
1203
1204        task->task_scsi_status = GOOD;
1205        transport_complete_task(task, 1);
1206        return 0;
1207}
1208
1209int target_emulate_synchronize_cache(struct se_task *task)
1210{
1211        struct se_device *dev = task->task_se_cmd->se_dev;
1212        struct se_cmd *cmd = task->task_se_cmd;
1213
1214        if (!dev->transport->do_sync_cache) {
1215                pr_err("SYNCHRONIZE_CACHE emulation not supported"
1216                        " for: %s\n", dev->transport->name);
1217                cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1218                return -ENOSYS;
1219        }
1220
1221        dev->transport->do_sync_cache(task);
1222        return 0;
1223}
1224
1225int target_emulate_noop(struct se_task *task)
1226{
1227        task->task_scsi_status = GOOD;
1228        transport_complete_task(task, 1);
1229        return 0;
1230}
1231
1232/*
1233 * Write a CDB into @cdb that is based on the one the intiator sent us,
1234 * but updated to only cover the sectors that the current task handles.
1235 */
1236void target_get_task_cdb(struct se_task *task, unsigned char *cdb)
1237{
1238        struct se_cmd *cmd = task->task_se_cmd;
1239        unsigned int cdb_len = scsi_command_size(cmd->t_task_cdb);
1240
1241        memcpy(cdb, cmd->t_task_cdb, cdb_len);
1242        if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
1243                unsigned long long lba = task->task_lba;
1244                u32 sectors = task->task_sectors;
1245
1246                switch (cdb_len) {
1247                case 6:
1248                        /* 21-bit LBA and 8-bit sectors */
1249                        cdb[1] = (lba >> 16) & 0x1f;
1250                        cdb[2] = (lba >> 8) & 0xff;
1251                        cdb[3] = lba & 0xff;
1252                        cdb[4] = sectors & 0xff;
1253                        break;
1254                case 10:
1255                        /* 32-bit LBA and 16-bit sectors */
1256                        put_unaligned_be32(lba, &cdb[2]);
1257                        put_unaligned_be16(sectors, &cdb[7]);
1258                        break;
1259                case 12:
1260                        /* 32-bit LBA and 32-bit sectors */
1261                        put_unaligned_be32(lba, &cdb[2]);
1262                        put_unaligned_be32(sectors, &cdb[6]);
1263                        break;
1264                case 16:
1265                        /* 64-bit LBA and 32-bit sectors */
1266                        put_unaligned_be64(lba, &cdb[2]);
1267                        put_unaligned_be32(sectors, &cdb[10]);
1268                        break;
1269                case 32:
1270                        /* 64-bit LBA and 32-bit sectors, extended CDB */
1271                        put_unaligned_be64(lba, &cdb[12]);
1272                        put_unaligned_be32(sectors, &cdb[28]);
1273                        break;
1274                default:
1275                        BUG();
1276                }
1277        }
1278}
1279EXPORT_SYMBOL(target_get_task_cdb);
1280
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